已知拋物线
经过点
和
,对称轴为直线
.
(1)求该拋物线的解析式;
(2)点
在线段
上,且
,若动点
从A点出发沿线段
以每秒1个单位长度的速度匀速运动,同时另一动点
以某一速度从
点出发沿线段
匀速运动,问是否存在某一时刻
,使线段
被直线
垂直平分?若存在,请求出此时的时间
(秒)和点
的运动速度,若不存在,请说明理由;
(3)在(2)的条件下,在
轴上是否存在点
,使
为等腰三角形?若存在,请求出所有点
的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c89cc81cb9a9e63ff98dee209d159c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b078bb1fc12bc4572a08f9c48997fefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/adb47459-0e93-49c4-bad6-872d9437c0a0.png?resizew=204)
(1)求该拋物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(3)在(2)的条件下,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a9dabb53dc826019fc8b6ae6d940c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
更新时间:2023-10-15 18:59:27
|
相似题推荐
解答题-问答题
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【推荐1】如图,在平面直角坐标系
中,抛物线
与
轴相交点
和点
,与
轴相交于点
,抛物线的顶点为点
,连接
、
、
、
.
(1)求这条抛物线的表达式及顶点
的坐标;
(2)求
的值;
(3)如果点
在
轴上,
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/30/0e96fa74-dddc-4331-8ac4-dbb3a805155c.png?resizew=171)
(1)求这条抛物线的表达式及顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719ee49c233abd269fd1b6d88f06af03.png)
(3)如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c2fa0d20e3f2a3004ce85114969b11b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐2】已知抛物线
经过点
和点
,与y轴交于点C,点P为第二象限内抛物线上的动点.
![](https://img.xkw.com/dksih/QBM/2020/12/29/2624578798886912/2626203720499200/STEM/fcec3646-b38e-4a94-a9d6-852e186730cd.png)
(1)求抛物线的解析式;
(2)过P点作x轴的垂线分别交BC、x轴于点D、E,设点P的横坐标为m.
①用含m的代数式表示线段PD的长;
②连接BP、CP,是否存在点P,使得四边形BPCO的面积最大?若存在,请求出四边形BPCO的最大面积;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4218690b49de906a22dda72c578956.png)
![](https://img.xkw.com/dksih/QBM/2020/12/29/2624578798886912/2626203720499200/STEM/fcec3646-b38e-4a94-a9d6-852e186730cd.png)
(1)求抛物线的解析式;
(2)过P点作x轴的垂线分别交BC、x轴于点D、E,设点P的横坐标为m.
①用含m的代数式表示线段PD的长;
②连接BP、CP,是否存在点P,使得四边形BPCO的面积最大?若存在,请求出四边形BPCO的最大面积;若不存在,请说明理由.
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名校
解题方法
【推荐1】如图,二次函数y=
x2+bx+c的图象与x轴交于A(3,0),B(-1,0),与y轴交于点C.若点P,Q同时从A点出发,都以每秒1个单位长度的速度分别沿AB,AC边运动,其中一点到达端点时,另一点也随之停止运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/24/f1207b4b-1ffe-47a4-9b99-2e1e12f40f77.png?resizew=190)
(1)求该二次函数的解析式及点C的坐标;
(2)当点P运动到B点时,点Q停止运动,这时,在x轴上是否存在点E,使得以A,E,Q为顶点的三角形为等腰三角形?若存在,请求出E点坐标;若不存在,请说明理由.
(3)当P,Q运动到t秒时,△APQ沿PQ翻折,点A恰好落在抛物线上D点处,请判定此时四边形APDQ的形状,并求出D点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/24/f1207b4b-1ffe-47a4-9b99-2e1e12f40f77.png?resizew=190)
(1)求该二次函数的解析式及点C的坐标;
(2)当点P运动到B点时,点Q停止运动,这时,在x轴上是否存在点E,使得以A,E,Q为顶点的三角形为等腰三角形?若存在,请求出E点坐标;若不存在,请说明理由.
(3)当P,Q运动到t秒时,△APQ沿PQ翻折,点A恰好落在抛物线上D点处,请判定此时四边形APDQ的形状,并求出D点坐标.
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解题方法
【推荐2】如图,顶点为
(
)的二次函数图象与
轴交于点
,点
在该图象上,直线
交二次函数图象对称轴
于点
,点
、
关于点
对称,连接
、
.
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695987163529216/2696655000969216/STEM/4f3a21d9-a5a3-47a3-9596-a887ea09a568.png)
(1)求该二次函数的关系式(用含
的式子表示).
(2)若点
在对称轴
右侧的二次函数图象上运动,请解答下列问题:
①连接
,当
时,请判断
的形状,并说明理由.
②求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b11d32a6773d9324124836aa3de36f98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a269ef1580b45c572e93ebe9864bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://img.xkw.com/dksih/QBM/2021/4/9/2695987163529216/2696655000969216/STEM/4f3a21d9-a5a3-47a3-9596-a887ea09a568.png)
(1)求该二次函数的关系式(用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a309d9a9fec1d78918173261401ca40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358819915af1bd6ce998edf7d14f9e28.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e700bb9fca80277f5e7c222ce22ce2.png)
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【推荐1】已知二次函数的解析式为:
(m是常数).
(1)当
时,求函数图象的顶点坐标和对称轴;
(2)若点
,
在函数图象上,求证:
;
(3)已知函数图象经过点
,
,
,若对于任意的
都满足
,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee223e1abbaa082dc8ea8af2527d4f3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/758c7726a4ed76236206eba5f5b5bcb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e83a0084f8619767deb74f0f5fdb8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9442765a1b2dd3f159a33eca372a41d.png)
(3)已知函数图象经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deddbfd86b9cfdaec43bf346e2364037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b5ebdf14bd72d1693ebb5fca0411f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13582f0869fb8c8a8f0e9cd40e625f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc7a87b52c7e945a4dbb751a9b49104.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf6654ca641d9de5ff38d03190a2987.png)
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【推荐2】定义:一个函数图象上若存在横、纵坐标相等的点,则称该点为这个函数图象的“1倍点”,若存在纵坐标是横坐标的2倍的点,则称该点为这个函数图象的“2倍点”.例如,点(﹣1,﹣1)是函数y=4x+3图象的“1倍点”,点(﹣
,﹣3)是函数y=4x+3图象的“2倍点”.
(1)函数y=x2﹣8的图象上是否存在“2倍点”?如果存在,求出“2倍点”;
(2)若抛物线y=ax2+5x+c上有且只有一个“1倍点”E,该抛物线与x轴交于M、N两点(点M在点N的左侧).当a>1时,求:
①c的取值范围;
②直接写出∠EMN的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(1)函数y=x2﹣8的图象上是否存在“2倍点”?如果存在,求出“2倍点”;
(2)若抛物线y=ax2+5x+c上有且只有一个“1倍点”E,该抛物线与x轴交于M、N两点(点M在点N的左侧).当a>1时,求:
①c的取值范围;
②直接写出∠EMN的度数.
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